166104919723 has 4 divisors (see below), whose sum is σ = 166106270088. Its totient is φ = 166103569360.

The previous prime is 166104919703. The next prime is 166104919733. The reversal of 166104919723 is 327919401661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 327919401661 = 2053 ⋅159726937.

It is a cyclic number.

It is not a de Polignac number, because 166104919723 - 2⁵ = 166104919691 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166104919703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469858 + ... + 743623.

It is an arithmetic number, because the mean of its divisors is an integer number (41526567522).

Almost surely, 2^166104919723 is an apocalyptic number.

166104919723 is a deficient number, since it is larger than the sum of its proper divisors (1350365).

166104919723 is a wasteful number, since it uses less digits than its factorization.

166104919723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350364.

The product of its (nonzero) digits is 489888, while the sum is 49.

The spelling of 166104919723 in words is "one hundred sixty-six billion, one hundred four million, nine hundred nineteen thousand, seven hundred twenty-three".